* Refactored bottomTab and bottomTabs

* Initial commit before switching to our fork of AHBottomNavigation

* Bump AHBottomNavigation version

* More work on BottomTab options

Need to merge some child options when a child is attached to parent

* Fix tests

* DefaultOptions refactor

* defaultOptions are now merged before applying options
* Handle BottomTab options in dedicated presenter
* Create BottomTabs in BottomTabsController.createView() instead of constructor

* Set bottomTab TypeFace

* Update Android installation guide

* fixed unit tests

* Fix unit tests

Kind of a workaround

* Handle NPE in getPreferredHeight

If a view hasn't been attached yet, return 0 height

* Apply BottomTab text and icon color individually

wix-playground/AHBottomNavigation does not support setting color for the entire tab (icon and text),
instead it supports setting color individually to text and icon. Another change is that it no longer supports
default color for icons. If icon color is undefined - it won't tint the icon.

* Add getCurrentChild to ParentController contract

* Clear backButton when setting stack root

* Add  ViewController.resolveCurrentOptions

resolveCurrentOptions merges the controllers options with all of its current children

* StackController refactor

* Create pushed child view only in StackController.createView
* When initialising a stack with multiple children, only create the top child's view
* StackController constructor now accepts children
* When pushing child to stack, apply options that change LayoutParams

* Apply BottomTabs layout options when tab views are created

* bototmTab changes in iOS

* options fix

* Fixes options propagating

This option allows to control when tab titles are displayed

* showWhenActive: when a tab is focused
* alwaysShow: show regardless of which tab is in
* alwaysHide: never show tab titles

Fixes #2996

* remove default values

* fix test

* Make detox android test suit pass

Disabled emulator animations due to limitation of espresso/detox which can't wait until
a push/pop animation ends

* Fix orientation parsing and enable detox orientation tests

* remove only

* Fix BottomTabs testId

* Support user orientation

* Fix rightButtons testId

* Add Modals tests

* e2e fix ios

* options

* proof of concept

* pop

* test fix

* default options

* scale

* rotation

* null check

* refactor

* refactor

* refactoring

* fix tests

* Rename TopBar.animateHide to animate

also fix some options in playground app

* Consolidate topBar visibility in childWillDisappear

* Rename BottomTabs.animateHide to animate

* Fix Options.copy
* Screens are now by default drawBehind: false

* Use AHBottomNavigation for BottomTabs

* Process passed options for all layout types

Static options are still processed only for components

* ios e2e fix

* Update RNNNavigationController.m

* Change topBar backgroundColor to Color object

* StackLayout implementation

Unfortunately, this commit also contains a lot of refactoring and a few
bug fixes relating to styles.

* TopBar is not part of Component, instead it's a part of StackLayout
  and shared between all components pushed to the stack Similar to iOS.
* Handle ScrollEvent in ReactView instead of passing the listener down
* Implement Fraction and Text null objects for style params
* Converted a few style params to null objects. This fixes some styles
  being applied even when they were not specified explicitly.
* Stop sending null promise to commands
* Seperate push and pop into animatePush/push and animatePop/pop
  to avoid boolean param

* Adapt TopTabs to new API

Usage
```js
Navigation.setDefaultOptions({
      topBar: {
        backgroundColor: 'red'
      }
    });
```

* readme

* dewfault values

* readme

* WIP

* ios, tests

* refactoring

* current tab

* android tests

* readme

* current tab index ios

* fix tests

* readme

* test fix

* probabl test fix